Hi John, they're both members of the Asteraceae family and the tree/shrub species of these in NZ are sometimes colloquially known as tree daisy. Daisies are most often a herb, but they incredibly variable (think Celmisia, tree Olearias, Leptinella, Sonchus etc). Some people are often confused in that the flowers in some "daisy" species have obvious "petals" (actually a ligule), such as dandelion, while the flower of other species, such as Leptinella and some tree daisies, have no obvious ligules and look like a button. Flowers of species classified in the Asteraceae are ALL clustered into a tightly-packed head and the flower's corolla is fused into a tube (among other characters) which is why such a range of forms are all classified together in the Asteraceae family! Sometimes this family is referred to as the Compositae and colloquially as the daisy family! Common names can be such fun .....